Flexible Printed Board Guide Mechanism for Lens Barrel Ghosting
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Solution Overview
Problem
Conventional imaging devices with flexible printed boards in lens barrels face issues with excessive length causing ghosting due to bending, which existing solutions attempt to address by adding parts and space, complicating downsizing and increasing manufacturing costs.
Innovation Solution
A guide mechanism that rolls the flexible printed board in a smaller space without additional parts, using a shifting cam barrel with a through-hole and rotary unit to adjust the board's position, reducing excessive length and preventing ghosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible printed board is made long enough to connect the electromagnetic driving section at both collapsed and extended positions, then electrical connection is maintained, but the board bends excessively and produces ghosting on images
Solution Approach 1:
The patent extracts the flexible printed board from the optical path by positioning it outside the light beam trajectory. The board is routed through a guide member that directs it away from the optical axis, eliminating the ghosting problem while maintaining electrical connectivity throughout the lens barrel's movement range.
Solution Approach 2:
The patent introduces a guide member that dynamically adjusts the position of the flexible printed board relative to the optical path. As the lens barrel extends or collapses, the guide member ensures the board remains positioned outside the light beam, adapting to changing positions without requiring the board to bend excessively.
2Object-affected harmful factors
If existing solutions add guide members or moving mechanisms to reduce flexible printed board length, then ghosting is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The guide member is designed to serve multiple functions: it guides the flexible printed board, maintains its position outside the optical path, and accommodates lens barrel movement. This multi-functionality reduces the need for additional specialized components, simplifying the overall structure while effectively preventing ghosting.
3Length of stationary object
If existing solutions add moving mechanisms to adjust flexible printed board position, then excessive length is reduced, but lens barrel downsizing becomes difficult
Solution Approach 1:
The guide member is integrated within the existing lens barrel structure, nesting the board guidance function within the available space. The flexible printed board is routed through channels and openings in the guide member that are incorporated into the lens barrel's existing geometry, avoiding the need for additional external mechanisms that would increase overall size.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the reduction or elimination of excessive flexible printed board length without additional components or space, facilitating lens barrel downsizing and reducing manufacturing costs while preventing ghosting in imaging devices.
Implementation Method 1
a shifting cam barrel provided inside the rotary unit and configured to shift in the optic-axial direction relative to the body unit
Data Source
AI summary
At least one exemplary embodiment is directed to a driving unit which has a through-hole that guides a flexible printed board. A position of the flexible printed board with respect to the driving unit changes in an optic-axial direction in accordance with rotation of the driving unit, reducing the occurrence of image ghost caused by the flexible printed board.